His work outside of Star Trek includes over a hundred films and seventy-five television guest roles. Much of his recent work, however, has been voice-over work in the English versions of Japanese anime films and television series.

He broke into film in the 1950s, alternating work for Roger Corman with work on the stage. He met Corman while studying acting from Jeff Corey, who is also an alumnus of the original Trek series. One of Forest's oldest friends is Leonard Nimoy.

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In 2013, Forest reprised his role as Apollo in the first episode of the TOS fan seriesStar Trek Continues, "Pilgrim of Eternity". His advanced age relative to only 2 years supposedly having passed (Star Trek Continues occurs in a 4th season timeline) is explained by having his energy drained by malfunctioning technology.